George being jealous of Justin's male friends and unpleasant towards them is not new (he did the same with Elliot). Given the little backstory we had for him at the start of the arc (the reaction to Tedd's hair) he's very likely to be gay.
As for Tedd being the reason Moperville is this way... I don't think so. Also I don't think it's usual for Tedd to have this aura - it's due to his recent discovery, as noted above. It is much more likely that it's Pandora's doing, and it's possible that she is doing that to Moperville because Tedd is there. So indirectly responsible, I can get behind, directly responsible not so much.